SVENSK STANDARD SS-EN 12676-2
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ICS 93.080.30
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Road equipment – Anti-glare systems for roads – Part 2:
Test methods
The European Standard EN 12676-2:2000 has the status of a Swedish Standard. This document con- tains the official English version of EN 12676-2:
2000.
Swedish Standards corresponding to documents referred to in this Standard are listed in ”Catalogue of Swedish Standards”, issued by SIS. The Cata- logue lists, with reference number and year of Swedish approval, International and European Standards approved as Swedish Standards as well as other Swedish Standards.
Vägutrustning – Bländskydd för vägar – Del 2: Provningsmetoder
Europastandarden EN 12676-2:2000 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN 12676-2:2000.
Motsvarigheten och aktualiteten i svensk standard till de publikationer som omnämns i denna stan- dard framgår av ”Katalog över svensk standard”, som ges ut av SIS. I katalogen redovisas interna- tionella och europeiska standarder som fastställts som svenska standarder och övriga gällande svenska standarder.
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12676-2
March 2000
ICS 93.080.30
English version
Anti-glare systems for roads - Part 2: Test methods
Systèmes anti-éblouissement routiers - Partie 2: Méthodes d'essai
Blendschutzsysteme für Straßen - Teil 2: Prüfverfahren
This European Standard was approved by CEN on 18 February 2000.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A L I S A T I O N E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G
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© 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.
Ref. No. EN 12676-2:2000 E
Page 2
EN 12676-2:2000
CONTENTS
Page
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Definitions and symbols... 4
4 Wind resistance test ... 5
5 Ageing tests ... 7
6 Measurement of the transmission factor... 9
7 Test report... 10
Bibliography ... 16
Page 3 EN 12676-2:2000
Foreword
This European Standard has been prepared by Technical Committee CEN/TC 226 ''Road equipment'' the Secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
This European Standard consists of the following Parts under the general title : Anti-glare systems for roads :
- Part 1 : Performance and characteristics ; - Part 2 : Test methods.
NOTE This draft standard was submitted to the CEN Enquiry as prEN 12677:1997.
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EN 12676-2:2000
1 Scope
This Part of EN 12676 specifies laboratory test methods which are necessary to ascertain the following characteristics of anti-glare systems:
wind resistance;
behaviour during artificial ageing;
measurement of the transmission factor.
2 Normative references
This Part of EN 12676 incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Part of EN 12676 only when incorporated in it by
amendment or revision. For undated references, the latest edition of the publication referred to applies.
ISO 4892-2 Plastics - Methods of exposure to laboratory light sources - Part 2:
Xenon arc sources
ISO 8256:1990 Plastics - Determination of tensile impact strength
ISO 9227:1990 Corrosion tests in artificial atmospheres - Salt spray tests ISO/CIE 10526:1991 CIE standard colorimetric illuminants
CIE No 15.2:1986 Colorimetry
EN 12676-1 Anti-glare systems for roads – Part 1: Performances and characteristics
3 Definitions and symbols
For the purposes of this Part of EN 12676, the definitions and symbols of EN 12676-1 and the following apply:
3.1 residual strain: the change in position of a point on the anti-glare system following the wind tunnel test, expressed as a percentage of its height above the fixed base of the anti- glare system
3.2 Cti: light transmission factor at specified angle of incidence i 3.3 Ii: incident luminous intensity
3.4 Iti: luminous intensity transmitted by the anti-glare system at specified angle of incidence i 3.5 rl: longitudinal position measurement in the wind tunnel
3.6 rt: transversal position measurement in the wind tunnel
Page 5 EN 12676-2:2000
3.7 T: height of measuring position from fixed base 3.8 dl: longitudinal residual strain (see figure 2) 3.9 dt: transverse residual strain (see figure 1)
4 Wind resistance test 4.1 Principle
This clause describes the test to be carried out in order to assess the changes and deformations which are caused to anti-glare systems, together with their mountings, by the action of wind.
The wind tunnel test is referred to as the wind resistance test.
The test is carried out in a wind tunnel. The test sample is subjected to a steady horizontal air stream of 40 m/s (144 km/h). After the test, the values of the strains dt and dl exhibited by the system are calculated.
The sample is fixed to a base at a height of 800 mm ± 50 mm above the turntable in the working section as shown in figures 3 and 4. The base is an open structure allowing the air to pass freely underneath.
At the start of the test the major axis of the system is placed perpendicular to the direction of the air stream. The test is carried out in two phases (see 4.4).
4.2 Apparatus
a) Wind tunnel, capable of producing an air stream of 40 m/s (144 km/h) in the centre of the working section, where a turntable is installed with the following characteristics (see figure 4):
diameter: 4,50 m minimum;
minimum range of rotation: +90° and -90°;
with a possibility of viewing the sample during the test, either directly or by means of video recording.
b) Device for measuring displacement, accurate to within 5 mm.
4.3 Test sample
The anti-glare system used as a sample shall be a minimum of 4 m in length.
Such a length may be obtained by combining several units or by using fractions of a unit.
One sample shall be tested.
Prior to the test, store the sample for at least 24 h in a room where the temperature conditions are similar to those in the working section of the wind tunnel.
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EN 12676-2:2000
4.4 Procedure 4.4.1 General
Execute the test at a temperature above 10 °C.
With the wind tunnel switched off, mount the sample on the turntable such that its major axis is perpendicular to the direction of the air stream.
4.4.2 Initial measurements
In the case of systems which are composed of separate units, take measurements for each unit.
In the case of systems which consist of a continuous screen, take equally spanned measurements (two per metre along the length of the sample). Mark these locations clearly.
Take measurements at the highest point of the system. For each of these measurement points, measure the following parameters:
T, r0t and r0l as shown (figure 1 and 2);
the temperature in the working section.
4.4.3 Wind test
Switch the wind tunnel on. Achieve gradually an air stream speed of 40 m/s by increasing the speed at the rate of 1 m/s (40 s required to reach the full speed of 40 m/s).
When the air stream reaches a speed of 40 m/s, rotate the turntable in an anti-clockwise direction (as seen from above), at 15° per minute. Stop the motion at +90°. Switch off the wind tunnel and return the turntable to the initial position.
Take the first series of measurements as described in 4.4.4.
Restart the wind tunnel and, when the air stream reaches a speed of 40 m/s, rotate the turntable in a clockwise direction at 15° per minute. Stop the motion at -90°. Switch off the wind tunnel and return the turntable to the initial position.
Take the second series of measurements as decribed in 4.4.4.
NOTE If in the course of the test the sample breaks or is subjected to excessive
deformation, the turntable should be stopped and the wind tunnel switched off. The angle at which the turntable has been stopped should be measured. The test should be
considered unsuccessful.
